diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7f7dcc3..7f71d0b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -17,9 +17,8 @@ jobs:
     strategy:
       matrix:
         php-version:
-          - "7.3"
-          - "7.4"
           - "8.0"
+          - "8.1"
         operating-system:
           - ubuntu-latest
           - windows-latest
diff --git a/README.md b/README.md
index e926673..ebd47db 100644
--- a/README.md
+++ b/README.md
@@ -24,10 +24,11 @@ Some meta values are collected into helper classes:
 
 ## Compatibility list
 
-| Corcel WooCommerce                                    | Laravel        | PHP version   |
-| ----------------------------------------------------- | -------------- | ------------- |
-| [1.x](https://github.com/corcel/woocommerce/tree/1.x) | 6.x, 7.x       | >= 7.2        |
-| 2.x (master)                                          | 6.x, 7.x, 8.x  | >= 7.3 \| 8.0 |
+| Corcel WooCommerce                                    | Laravel        | PHP version   | Supported          |
+| ----------------------------------------------------- | -------------- | ------------- | ------------------ |
+| 3.x (master)                                          | 9.x            | >= 8.0.3      | :white_check_mark: |
+| [2.x](https://github.com/corcel/woocommerce/tree/2.x) | 6.x, 7.x, 8.x  | >= 7.3 \| 8.0 | :white_check_mark: |
+| [1.x](https://github.com/corcel/woocommerce/tree/1.x) | 6.x, 7.x       | >= 7.2        | :x:                |
 
 ## Installation
 
diff --git a/composer.json b/composer.json
index 0d4cb11..61c845e 100644
--- a/composer.json
+++ b/composer.json
@@ -11,18 +11,18 @@
         }
     ],
     "require": {
-        "php": "^7.3|^8.0",
-        "illuminate/database": "^6.0|^7.0|^8.0",
-        "illuminate/support": "^6.0|^7.0|^8.0",
-        "jgrossi/corcel": "^3.0|^4.0|^5.0",
-        "nesbot/carbon": "^2.0"
+        "php": "^8.0.3",
+        "illuminate/database": "^9.0",
+        "illuminate/support": "^9.0",
+        "jgrossi/corcel": "^6.0",
+        "nesbot/carbon": "^2.53.1"
     },
     "require-dev": {
-        "orchestra/testbench": "^4.0|^5.0|^6.0",
-        "phpstan/phpstan": "^0.12.46",
+        "orchestra/testbench": "^7.0",
+        "phpstan/phpstan": "^1.0",
         "phpunit/phpunit": "^9.4",
-        "laravel/legacy-factories": "^1.0",
-        "nunomaduro/larastan": "^0.7.13"
+        "nunomaduro/larastan": "^2.0",
+        "laravel/pint": "^0.2.0"
     },
     "autoload": {
         "psr-4": {
@@ -31,7 +31,8 @@
     },
     "autoload-dev": {
         "psr-4": {
-            "Tests\\": "tests/"
+            "Tests\\": "tests/",
+            "Database\\Factories\\": "tests/database/factories/"
         }
     }
 }
diff --git a/phpstan.neon b/phpstan.neon
index 8e8ef25..343b1dc 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -6,12 +6,12 @@ parameters:
         - src
         - tests
 
-    level: 8
+    level: max
 
     noUnnecessaryCollectionCall: false
 
     stubFiles:
-        - tests/stubs/Taxonomy.php.stub
+        - stubs/Corcel.stub
 
     ignoreErrors:
         -
diff --git a/src/Model/Builder/OrderBuilder.php b/src/Model/Builder/OrderBuilder.php
index ccfc499..3f11fba 100644
--- a/src/Model/Builder/OrderBuilder.php
+++ b/src/Model/Builder/OrderBuilder.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Model\Builder;
@@ -97,7 +98,7 @@ public function status($status): PostBuilder
         ];
 
         if (in_array($status, $builtin)) {
-            $status = 'wc-' . $status;
+            $status = 'wc-'.$status;
         }
 
         return parent::status($status);
diff --git a/src/Model/Customer.php b/src/Model/Customer.php
index 6e74248..1ff38e5 100644
--- a/src/Model/Customer.php
+++ b/src/Model/Customer.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Model;
@@ -6,26 +7,43 @@
 use Corcel\Model\User;
 use Corcel\WooCommerce\Traits\AddressesTrait;
 use Corcel\WooCommerce\Traits\HasRelationsThroughMeta;
+use Database\Factories\CustomerFactory;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 
 /**
- * @property int                                       $order_count
- * @property \Illuminate\Database\Eloquent\Collection  $orders
+ * @property int         $order_count
+ * @property Collection  $orders
  */
 class Customer extends User
 {
+    use HasFactory;
     use AddressesTrait;
+
+    /**
+     * @use HasRelationsThroughMeta<\Illuminate\Database\Eloquent\Model>
+     */
     use HasRelationsThroughMeta;
 
     /**
      * @inheritDoc
      *
-     * @var  string[]
+     * @var  array<string>
      */
     protected $appends = [
         'order_count',
     ];
 
+    /**
+     * Create a new factory instance for the model.
+     *
+     * @return CustomerFactory
+     */
+    protected static function newFactory(): CustomerFactory
+    {
+        return CustomerFactory::new();
+    }
+
     /**
      * Get order count attribute.
      *
@@ -33,13 +51,15 @@ class Customer extends User
      */
     protected function getOrderCountAttribute(): int
     {
-        return (int) $this->getMeta('_order_count');
+        $count = $this->getMeta('_order_count');
+
+        return is_numeric($count) ? (int) $count : 0;
     }
 
     /**
      * Get the related orders.
      *
-     * @return  \Illuminate\Database\Eloquent\Relations\HasMany
+     * @return  HasMany<\Illuminate\Database\Eloquent\Model>
      */
     public function orders(): HasMany
     {
diff --git a/src/Model/Item.php b/src/Model/Item.php
index d98886c..643782d 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Model;
@@ -7,6 +8,8 @@
 use Corcel\Concerns\MetaFields;
 use Corcel\Model;
 use Corcel\WooCommerce\Model\Meta\ItemMeta;
+use Database\Factories\ItemFactory;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 
@@ -31,13 +34,14 @@
  */
 class Item extends Model
 {
+    use HasFactory;
     use Aliases;
     use MetaFields;
 
     /**
      * The model aliases.
      *
-     * @var  string[][]|string[]
+     * @var  array<string, string>|array<string, array<string, string>>
      */
     protected static $aliases = [
         'id'           => 'order_item_id',
@@ -50,7 +54,7 @@ class Item extends Model
     /**
      * @inheritDoc
      *
-     * @var  string[]
+     * @var  array<string>
      */
     protected $appends = [
         'quantity',
@@ -82,14 +86,26 @@ class Item extends Model
      */
     public $timestamps = false;
 
+    /**
+     * Create a new factory instance for the model.
+     *
+     * @return ItemFactory
+     */
+    protected static function newFactory(): ItemFactory
+    {
+        return ItemFactory::new();
+    }
+
     /**
      * Get the line subtotal attribute.
      *
      * @return  string|null
      */
-    protected function getLineSubtotalAttribute()
+    protected function getLineSubtotalAttribute(): ?string
     {
-        return $this->getMeta('_line_subtotal');
+        $lineSubtotal = $this->getMeta('_line_subtotal');
+
+        return is_scalar($lineSubtotal) ? (string) $lineSubtotal : null;
     }
 
     /**
@@ -97,9 +113,11 @@ protected function getLineSubtotalAttribute()
      *
      * @return  string|null
      */
-    protected function getLineSubtotalTaxAttribute()
+    protected function getLineSubtotalTaxAttribute(): ?string
     {
-        return $this->getMeta('_line_subtotal_tax');
+        $lineSubtotalTax = $this->getMeta('_line_subtotal_tax');
+
+        return is_scalar($lineSubtotalTax) ? (string) $lineSubtotalTax : null;
     }
 
     /**
@@ -107,9 +125,11 @@ protected function getLineSubtotalTaxAttribute()
      *
      * @return  string|null
      */
-    protected function getLineTaxAttribute()
+    protected function getLineTaxAttribute(): ?string
     {
-        return $this->getMeta('_line_tax');
+        $lineTax = $this->getMeta('_line_tax');
+
+        return is_scalar($lineTax) ? (string) $lineTax : null;
     }
 
     /**
@@ -117,9 +137,11 @@ protected function getLineTaxAttribute()
      *
      * @return  string|null
      */
-    protected function getLineTotalAttribute()
+    protected function getLineTotalAttribute(): ?string
     {
-        return $this->getMeta('_line_total');
+        $lineTotal = $this->getMeta('_line_total');
+
+        return is_scalar($lineTotal) ? (string) $lineTotal : null;
     }
 
     /**
@@ -127,9 +149,11 @@ protected function getLineTotalAttribute()
      *
      * @return  string|null
      */
-    protected function getQuantityAttribute()
+    protected function getQuantityAttribute(): ?string
     {
-        return $this->getMeta('_qty');
+        $quantity = $this->getMeta('_qty');
+
+        return is_scalar($quantity) ? (string) $quantity : null;
     }
 
     /**
@@ -137,15 +161,17 @@ protected function getQuantityAttribute()
      *
      * @return  string|null
      */
-    protected function getTaxClassAttribute()
+    protected function getTaxClassAttribute(): ?string
     {
-        return $this->getMeta('_tax_class');
+        $taxClass = $this->getMeta('_tax_class');
+
+        return is_scalar($taxClass) ? (string) $taxClass : null;
     }
 
     /**
      * @inheritDoc
      *
-     * @return  \Illuminate\Database\Eloquent\Relations\HasMany
+     * @return  HasMany<ItemMeta>
      */
     public function meta(): HasMany
     {
@@ -155,7 +181,7 @@ public function meta(): HasMany
     /**
      * Get the related order.
      *
-     * @return  \Illuminate\Database\Eloquent\Relations\BelongsTo
+     * @return  BelongsTo<Order, Item>
      */
     public function order(): BelongsTo
     {
@@ -165,7 +191,7 @@ public function order(): BelongsTo
     /**
      * Get the related product.
      *
-     * @return  \Illuminate\Database\Eloquent\Relations\BelongsTo
+     * @return  BelongsTo<Product, Item>
      */
     public function product(): BelongsTo
     {
diff --git a/src/Model/Meta/ItemMeta.php b/src/Model/Meta/ItemMeta.php
index 3c1930e..37e9cda 100644
--- a/src/Model/Meta/ItemMeta.php
+++ b/src/Model/Meta/ItemMeta.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Model\Meta;
diff --git a/src/Model/Order.php b/src/Model/Order.php
index 7512278..c26bf1a 100644
--- a/src/Model/Order.php
+++ b/src/Model/Order.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Model;
@@ -10,25 +11,29 @@
 use Corcel\WooCommerce\Model\Builder\OrderBuilder;
 use Corcel\WooCommerce\Support\Payment;
 use Corcel\WooCommerce\Traits\AddressesTrait;
+use Database\Factories\OrderFactory;
+use Illuminate\Database\Eloquent\Collection;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 
 /**
- * @property int|null                                  $customer_id
- * @property string|null                               $currency
- * @property string|null                               $total
- * @property string|null                               $shipping
- * @property string|null                               $tax
- * @property string|null                               $shipping_tax
- * @property string                                    $status
- * @property \Carbon\Carbon|null                       $date_completed
- * @property \Carbon\Carbon|null                       $date_paid
- * @property \Corcel\WooCommerce\Support\Payment       $payment
- * @property \Corcel\WooCommerce\Model\Customer|null   $customer
- * @property \Illuminate\Database\Eloquent\Collection  $items
+ * @property int|null       $customer_id
+ * @property string|null    $currency
+ * @property string|null    $total
+ * @property string|null    $shipping
+ * @property string|null    $tax
+ * @property string|null    $shipping_tax
+ * @property string         $status
+ * @property Carbon|null    $date_completed
+ * @property Carbon|null    $date_paid
+ * @property Payment        $payment
+ * @property Customer|null  $customer
+ * @property Collection     $items
  */
 class Order extends Post
 {
+    use HasFactory;
     use Aliases;
     use AddressesTrait;
     use MetaFields;
@@ -36,7 +41,7 @@ class Order extends Post
     /**
      * The model aliases.
      *
-     * @var  string[][]
+     * @var  array<string, array<string, string>>
      */
     protected static $aliases = [
         'customer_id' => ['meta' => '_customer_user'],
@@ -45,7 +50,7 @@ class Order extends Post
     /**
      * @inheritDoc
      *
-     * @var  string[]
+     * @var  array<string>
      */
     protected $appends = [
         'currency',
@@ -66,6 +71,16 @@ class Order extends Post
      */
     protected $postType = 'shop_order';
 
+    /**
+     * Create a new factory instance for the model.
+     *
+     * @return OrderFactory
+     */
+    protected static function newFactory(): OrderFactory
+    {
+        return OrderFactory::new();
+    }
+
     /**
      * @inheritDoc
      */
@@ -81,7 +96,9 @@ public function newEloquentBuilder($builder): OrderBuilder
      */
     protected function getCurrencyAttribute(): ?string
     {
-        return $this->getMeta('_order_currency');
+        $currency = $this->getMeta('_order_currency');
+
+        return is_scalar($currency) ? (string) $currency : null;
     }
 
     /**
@@ -91,7 +108,9 @@ protected function getCurrencyAttribute(): ?string
      */
     protected function getTotalAttribute(): ?string
     {
-        return $this->getMeta('_order_total');
+        $total = $this->getMeta('_order_total');
+
+        return is_scalar($total) ? (string) $total : null;
     }
 
     /**
@@ -101,7 +120,9 @@ protected function getTotalAttribute(): ?string
      */
     protected function getShippingAttribute(): ?string
     {
-        return $this->getMeta('_order_shipping');
+        $shipping = $this->getMeta('_order_shipping');
+
+        return is_scalar($shipping) ? (string) $shipping : null;
     }
 
     /**
@@ -111,7 +132,9 @@ protected function getShippingAttribute(): ?string
      */
     protected function getTaxAttribute(): ?string
     {
-        return $this->getMeta('_order_tax');
+        $tax = $this->getMeta('_order_tax');
+
+        return is_scalar($tax) ? (string) $tax : null;
     }
 
     /**
@@ -121,7 +144,9 @@ protected function getTaxAttribute(): ?string
      */
     protected function getShippingTaxAttribute(): ?string
     {
-        return $this->getMeta('_order_shipping_tax');
+        $shippingTax = $this->getMeta('_order_shipping_tax');
+
+        return is_scalar($shippingTax) ? (string) $shippingTax : null;
     }
 
     /**
@@ -139,13 +164,13 @@ public function getStatusAttribute(): string
     /**
      * Get the completed date attribute.
      *
-     * @return \Carbon\Carbon|null
+     * @return Carbon|null
      */
     protected function getDateCompletedAttribute(): ?Carbon
     {
         $value = $this->getMeta('_date_completed');
 
-        if ($value !== null) {
+        if (is_numeric($value)) {
             return Carbon::createFromTimestamp($value);
         }
 
@@ -155,7 +180,7 @@ protected function getDateCompletedAttribute(): ?Carbon
          */
         $value = $this->getMeta('_completed_date');
 
-        if ($value !== null) {
+        if (is_string($value)) {
             $datetime = Carbon::createFromFormat('Y-m-d H:i:s', $value);
 
             return $datetime !== false ? $datetime : null;
@@ -167,13 +192,13 @@ protected function getDateCompletedAttribute(): ?Carbon
     /**
      * Get the paid date attribute.
      *
-     * @return \Carbon\Carbon|null
+     * @return Carbon|null
      */
     public function getDatePaidAttribute(): ?Carbon
     {
         $value = $this->getMeta('_date_paid');
 
-        if ($value !== null) {
+        if (is_numeric($value)) {
             return Carbon::createFromTimestamp($value);
         }
 
@@ -183,7 +208,7 @@ public function getDatePaidAttribute(): ?Carbon
          */
         $value = $this->getMeta('_paid_date');
 
-        if ($value !== null) {
+        if (is_string($value)) {
             $datetime = Carbon::createFromFormat('Y-m-d H:i:s', $value);
 
             return $datetime !== false ? $datetime : null;
@@ -195,7 +220,7 @@ public function getDatePaidAttribute(): ?Carbon
     /**
      * Get the payment attribute.
      *
-     * @return \Corcel\WooCommerce\Support\Payment
+     * @return Payment
      */
     public function getPaymentAttribute(): Payment
     {
@@ -205,7 +230,7 @@ public function getPaymentAttribute(): Payment
     /**
      * Get the related customer.
      *
-     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
+     * @return BelongsTo<Customer, Order>
      */
     public function customer(): BelongsTo
     {
@@ -215,7 +240,7 @@ public function customer(): BelongsTo
     /**
      * Get related items.
      *
-     * @return  \Illuminate\Database\Eloquent\Relations\HasMany
+     * @return  HasMany<Item>
      */
     public function items(): HasMany
     {
diff --git a/src/Model/Product.php b/src/Model/Product.php
index b62a730..5b6545b 100644
--- a/src/Model/Product.php
+++ b/src/Model/Product.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Model;
@@ -8,55 +9,62 @@
 use Corcel\Model\Attachment;
 use Corcel\Model\Post;
 use Corcel\WooCommerce\Traits\HasRelationsThroughMeta;
+use Database\Factories\ProductFactory;
 use Illuminate\Database\Eloquent\Collection;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Support\Collection as BaseCollection;
 use Illuminate\Support\Str;
 
 /**
- * @property string|null                               $price
- * @property string|null                               $regular_price
- * @property string|null                               $sale_price
- * @property bool                                      $on_sale
- * @property string|null                               $sku
- * @property string|null                               $tax_status
- * @property bool                                      $is_taxable
- * @property string|null                               $weight
- * @property string|null                               $length
- * @property string|null                               $width
- * @property string|null                               $height
- * @property bool                                      $is_virtual
- * @property bool                                      $is_downloadable
- * @property string|null                               $stock
- * @property bool                                      $in_stock
- * @property string|null                               $type
- * @property \Illuminate\Support\Collection            $attributes
- * @property \Illuminate\Database\Eloquent\Collection  $crosssells
- * @property \Illuminate\Database\Eloquent\Collection  $upsells
- * @property \Illuminate\Support\Collection            $gallery
- * @property \Illuminate\Database\Eloquent\Collection  $categories
- * @property \Illuminate\Database\Eloquent\Collection  $items
- * @property \Illuminate\Database\Eloquent\Collection  $productTypes
- * @property \Illuminate\Database\Eloquent\Collection  $tags
+ * @property string|null              $price
+ * @property string|null              $regular_price
+ * @property string|null              $sale_price
+ * @property bool                     $on_sale
+ * @property string|null              $sku
+ * @property string|null              $tax_status
+ * @property bool                     $is_taxable
+ * @property string|null              $weight
+ * @property string|null              $length
+ * @property string|null              $width
+ * @property string|null              $height
+ * @property bool                     $is_virtual
+ * @property bool                     $is_downloadable
+ * @property string|null              $stock
+ * @property bool                     $in_stock
+ * @property string|null              $type
+ * @property BaseCollection           $attributes
+ * @property Collection<Product>      $crosssells
+ * @property Collection               $upsells
+ * @property BaseCollection           $gallery
+ * @property Collection               $categories
+ * @property Collection               $items
+ * @property Collection<ProductType>  $productTypes
+ * @property Collection               $tags
  */
 class Product extends Post
 {
+    use HasFactory;
     use Aliases;
     use MetaFields;
+
+    /**
+     * @use HasRelationsThroughMeta<\Illuminate\Database\Eloquent\Model>
+     */
     use HasRelationsThroughMeta;
 
     /**
      * Preloaded product attributes list.
      *
-     * @var  \Illuminate\Database\Eloquent\Collection<\Corcel\WooCommerce\Model\ProductAttribute>
+     * @var  Collection<string, ProductAttribute>
      */
     protected static $productAttributes;
 
     /**
      * @inheritDoc
      *
-     * @var  string[]
+     * @var  array<string>
      */
     protected $appends = [
         'price',
@@ -92,6 +100,16 @@ protected static function boot()
         static::$productAttributes = ProductAttribute::all()->keyBy('attribute_name');
     }
 
+    /**
+     * Create a new factory instance for the model.
+     *
+     * @return ProductFactory
+     */
+    protected static function newFactory(): ProductFactory
+    {
+        return ProductFactory::new();
+    }
+
     /**
      * Get the price attribute.
      *
@@ -99,7 +117,9 @@ protected static function boot()
      */
     protected function getPriceAttribute(): ?string
     {
-        return $this->getMeta('_price');
+        $price = $this->getMeta('_price');
+
+        return is_scalar($price) ? (string) $price : null;
     }
 
     /**
@@ -109,7 +129,9 @@ protected function getPriceAttribute(): ?string
      */
     protected function getRegularPriceAttribute(): ?string
     {
-        return $this->getMeta('_regular_price');
+        $regularPrice = $this->getMeta('_regular_price');
+
+        return is_scalar($regularPrice) ? (string) $regularPrice : null;
     }
 
     /**
@@ -119,7 +141,9 @@ protected function getRegularPriceAttribute(): ?string
      */
     protected function getSalePriceAttribute(): ?string
     {
-        return $this->getMeta('_sale_price');
+        $salePrice = $this->getMeta('_sale_price');
+
+        return is_scalar($salePrice) ? (string) $salePrice : null;
     }
 
     /**
@@ -129,7 +153,7 @@ protected function getSalePriceAttribute(): ?string
      */
     protected function getOnSaleAttribute(): bool
     {
-        return !empty($this->sale_price) && $this->sale_price < $this->regular_price;
+        return ! empty($this->sale_price) && $this->sale_price < $this->regular_price;
     }
 
     /**
@@ -139,7 +163,9 @@ protected function getOnSaleAttribute(): bool
      */
     protected function getSkuAttribute(): ?string
     {
-        return $this->getMeta('_sku');
+        $sku = $this->getMeta('_sku');
+
+        return is_scalar($sku) ? (string) $sku : null;
     }
 
     /**
@@ -149,7 +175,9 @@ protected function getSkuAttribute(): ?string
      */
     protected function getTaxStatusAttribute(): ?string
     {
-        return $this->getMeta('_tax_status');
+        $taxStatus = $this->getMeta('_tax_status');
+
+        return is_scalar($taxStatus) ? (string) $taxStatus : null;
     }
 
     /**
@@ -169,7 +197,9 @@ public function getIsTaxableAttribute(): bool
      */
     protected function getWeightAttribute(): ?string
     {
-        return $this->getMeta('_weight');
+        $weight = $this->getMeta('_weight');
+
+        return is_scalar($weight) ? (string) $weight : null;
     }
 
     /**
@@ -179,7 +209,9 @@ protected function getWeightAttribute(): ?string
      */
     protected function getLengthAttribute(): ?string
     {
-        return $this->getMeta('_length');
+        $length = $this->getMeta('_length');
+
+        return is_scalar($length) ? (string) $length : null;
     }
 
     /**
@@ -189,7 +221,9 @@ protected function getLengthAttribute(): ?string
      */
     protected function getWidthAttribute(): ?string
     {
-        return $this->getMeta('_width');
+        $width = $this->getMeta('_width');
+
+        return is_scalar($width) ? (string) $width : null;
     }
 
     /**
@@ -199,7 +233,9 @@ protected function getWidthAttribute(): ?string
      */
     protected function getHeightAttribute(): ?string
     {
-        return $this->getMeta('_height');
+        $height = $this->getMeta('_height');
+
+        return is_scalar($height) ? (string) $height : null;
     }
 
     /**
@@ -229,7 +265,9 @@ protected function getIsDownloadableAttribute(): bool
      */
     protected function getStockAttribute(): ?string
     {
-        return $this->getMeta('_stock');
+        $stock = $this->getMeta('_stock');
+
+        return is_scalar($stock) ? (string) $stock : null;
     }
 
     /**
@@ -245,7 +283,7 @@ protected function getInStockAttribute(): bool
     /**
      * Get the product attributes attribute.
      *
-     * @return  \Illuminate\Support\Collection<\Corcel\WooCommerce\Model\ProductAttribute>
+     * @return  BaseCollection<string, ProductAttribute>
      */
     protected function getAttributesAttribute(): BaseCollection
     {
@@ -270,15 +308,20 @@ protected function getAttributesAttribute(): BaseCollection
     /**
      * Get the cross-sells attribute.
      *
-     * @return \Illuminate\Database\Eloquent\Collection<mixed>
+     * @return Collection<int, Product>
      */
     protected function getCrosssellsAttribute(): Collection
     {
         $crosssells = $this->getMeta('_crosssell_ids');
+
+        if (! is_string($crosssells)) {
+            return static::newCollection();
+        }
+
         $crosssells = unserialize($crosssells);
 
         if (empty($crosssells)) {
-            return new Collection();
+            return static::newCollection();
         }
 
         return static::query()->whereIn('ID', $crosssells)->get();
@@ -287,15 +330,20 @@ protected function getCrosssellsAttribute(): Collection
     /**
      * Get the up-sells attribute.
      *
-     * @return \Illuminate\Database\Eloquent\Collection<mixed>
+     * @return Collection<int, Product>
      */
     public function getUpsellsAttribute(): Collection
     {
         $upsells = $this->getMeta('_upsell_ids');
+
+        if (! is_string($upsells)) {
+            return static::newCollection();
+        }
+
         $upsells = unserialize($upsells);
 
         if (empty($upsells)) {
-            return new Collection();
+            return static::newCollection();
         }
 
         return static::query()->whereIn('ID', $upsells)->get();
@@ -304,7 +352,7 @@ public function getUpsellsAttribute(): Collection
     /**
      * Get the gallery attribute.
      *
-     * @return \Illuminate\Support\Collection<\Corcel\Model\Attachment>
+     * @return BaseCollection<int, Attachment>
      */
     public function getGalleryAttribute(): BaseCollection
     {
@@ -316,12 +364,12 @@ public function getGalleryAttribute(): BaseCollection
 
         $attachmentsId = $this->getMeta('_product_image_gallery');
 
-        if (empty($attachmentsId)) {
+        if (! is_string($attachmentsId) || empty($attachmentsId)) {
             return $gallery;
         }
 
         $attachmentsId = explode(',', $attachmentsId);
-        $attachments   = Attachment::query()->whereIn('ID', $attachmentsId)->get();
+        $attachments = Attachment::query()->whereIn('ID', $attachmentsId)->get();
 
         return $gallery->merge($attachments);
     }
@@ -333,13 +381,16 @@ public function getGalleryAttribute(): BaseCollection
      */
     protected function getTypeAttribute(): ?string
     {
-        return $this->productTypes->pluck('term.name')->first();
+        /** @var BaseCollection<int, string> */
+        $productTypeNames = $this->productTypes->pluck('term.name');
+
+        return $productTypeNames->first();
     }
 
     /**
      * Get the related categories.
      *
-     * @return  \Illuminate\Database\Eloquent\Relations\BelongsToMany
+     * @return  BelongsToMany<ProductCategory>
      */
     public function categories(): BelongsToMany
     {
@@ -354,7 +405,7 @@ public function categories(): BelongsToMany
     /**
      * Get the related items.
      *
-     * @return  \Illuminate\Database\Eloquent\Relations\HasMany
+     * @return  HasMany<\Illuminate\Database\Eloquent\Model>
      */
     public function items(): HasMany
     {
@@ -369,7 +420,7 @@ public function items(): HasMany
     /**
      * Get the related product types.
      *
-     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
+     * @return BelongsToMany<ProductType>
      */
     public function productTypes(): BelongsToMany
     {
@@ -384,7 +435,7 @@ public function productTypes(): BelongsToMany
     /**
      * Get the related tags.
      *
-     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
+     * @return BelongsToMany<ProductTag>
      */
     public function tags(): BelongsToMany
     {
diff --git a/src/Model/ProductAttribute.php b/src/Model/ProductAttribute.php
index 266ea66..6bb6df3 100644
--- a/src/Model/ProductAttribute.php
+++ b/src/Model/ProductAttribute.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Model;
@@ -28,14 +29,14 @@ class ProductAttribute extends Model
     /**
      * The terms collection.
      *
-     * @var  \Illuminate\Support\Collection<mixed>
+     * @var  Collection<int, mixed>
      */
-    public $terms;
+    public Collection $terms;
 
     /**
      * The model aliases.
      *
-     * @var  string[]
+     * @var  array<string, string>
      */
     protected static $aliases = [
         'id'       => 'attribute_id',
@@ -49,7 +50,7 @@ class ProductAttribute extends Model
     /**
      * @inheritDoc
      *
-     * @var  string[]
+     * @var  array<string, string>
      */
     protected $casts = [
         'attribute_public' => 'bool',
@@ -68,7 +69,7 @@ class ProductAttribute extends Model
     /**
      * Set the product terms.
      *
-     * @param  \Illuminate\Support\Collection<mixed>  $terms
+     * @param  Collection<int, mixed>  $terms
      */
     public function setTerms(Collection $terms): void
     {
diff --git a/src/Model/ProductCategory.php b/src/Model/ProductCategory.php
index ef6d7eb..56456ab 100644
--- a/src/Model/ProductCategory.php
+++ b/src/Model/ProductCategory.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Model;
diff --git a/src/Model/ProductTag.php b/src/Model/ProductTag.php
index d3056a6..3621496 100644
--- a/src/Model/ProductTag.php
+++ b/src/Model/ProductTag.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Model;
diff --git a/src/Model/ProductType.php b/src/Model/ProductType.php
index aa1ea19..c368670 100644
--- a/src/Model/ProductType.php
+++ b/src/Model/ProductType.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Model;
diff --git a/src/Support/Address.php b/src/Support/Address.php
index 55b6242..ed4c11b 100644
--- a/src/Support/Address.php
+++ b/src/Support/Address.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Support;
@@ -10,39 +11,42 @@
 use Illuminate\Contracts\Support\Jsonable;
 use InvalidArgumentException;
 
+/**
+ * @implements Arrayable<string, mixed>
+ */
 class Address implements Arrayable, Jsonable
 {
     /**
      * The model instance.
      *
-     * @var  \Corcel\Model
+     * @var  Model
      */
-    protected $model;
+    protected Model $model;
 
     /**
      * The address type.
      *
      * @var  string
      */
-    protected $type;
+    protected string $type;
 
     /**
      * The address attributes.
      *
-     * @var  mixed[]
+     * @var  array<string, mixed>
      */
-    protected $attributes = [];
+    protected array $attributes = [];
 
     /**
      * The address constructor.
      *
-     * @param  \Corcel\Model  $model
-     * @param  string         $type
+     * @param  Model  $model
+     * @param  string  $type
      */
     public function __construct(Model $model, string $type)
     {
         $this->model = $model;
-        $this->type  = $type;
+        $this->type = $type;
 
         $this->parseAttributes();
     }
@@ -65,7 +69,7 @@ protected function parseAttributes(): void
     /**
      * List of the attribute keys.
      *
-     * @return  string[]
+     * @return  array<string>
      */
     protected function attributeKeys(): array
     {
@@ -94,7 +98,7 @@ protected function attributeKeys(): array
     /**
      * Get meta key for given attribute name.
      *
-     * @param   string  $key
+     * @param  string  $key
      * @return  string
      */
     protected function getMetaKey(string $key): string
@@ -126,7 +130,7 @@ protected function metaKeyPattern(): string
     /**
      * @inheritDoc
      *
-     * @return  mixed[]
+     * @return  array<string, mixed>
      */
     public function toArray(): array
     {
@@ -136,7 +140,7 @@ public function toArray(): array
     /**
      * @inheritDoc
      *
-     * @param   int     $options
+     * @param  int  $options
      * @return  string
      */
     public function toJson($options = 0): string
@@ -153,7 +157,7 @@ public function toJson($options = 0): string
     /**
      * Magic method to get address attributes.
      *
-     * @param   string  $key
+     * @param  string  $key
      * @return  mixed
      */
     public function __get(string $key)
diff --git a/src/Support/BillingAddress.php b/src/Support/BillingAddress.php
index 06286e4..2db14d9 100644
--- a/src/Support/BillingAddress.php
+++ b/src/Support/BillingAddress.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Support;
@@ -23,7 +24,7 @@ class BillingAddress extends Address
     /**
      * @inheritDoc
      *
-     * @param \Corcel\Model $model
+     * @param  Model  $model
      */
     public function __construct(Model $model)
     {
diff --git a/src/Support/Payment.php b/src/Support/Payment.php
index 4bda083..0832e9c 100644
--- a/src/Support/Payment.php
+++ b/src/Support/Payment.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Support;
@@ -8,6 +9,9 @@
 use Illuminate\Contracts\Support\Jsonable;
 use InvalidArgumentException;
 
+/**
+ * @implements Arrayable<string, mixed>
+ */
 class Payment implements Arrayable, Jsonable
 {
     /**
@@ -15,38 +19,42 @@ class Payment implements Arrayable, Jsonable
      *
      * @var  string|null
      */
-    public $method;
+    public ?string $method = null;
 
     /**
      * The payment method title.
      *
      * @var  string|null
      */
-    public $method_title;
+    public ?string $method_title = null;
 
     /**
      * The payment transation identificator.
      *
      * @var  string|null
      */
-    public $transaction_id;
+    public ?string $transaction_id = null;
 
     /**
      * The payment constructor.
      *
-     * @param  \Corcel\WooCommerce\Model\Order  $order
+     * @param  Order  $order
      */
     public function __construct(Order $order)
     {
-        $this->method         = $order->getMeta('_payment_method');
-        $this->method_title   = $order->getMeta('_payment_method_title');
-        $this->transaction_id = $order->getMeta('_transaction_id');
+        $method = $order->getMeta('_payment_method');
+        $methodTitle = $order->getMeta('_payment_method_title');
+        $transactionId = $order->getMeta('_transaction_id');
+
+        $this->method = is_scalar($method) ? (string) $method : null;
+        $this->method_title = is_scalar($methodTitle) ? (string) $methodTitle : null;
+        $this->transaction_id = is_scalar($transactionId) ? (string) $transactionId : null;
     }
 
     /**
      * @inheritDoc
      *
-     * @return  mixed[]
+     * @return  array<string, mixed>
      */
     public function toArray(): array
     {
@@ -60,7 +68,7 @@ public function toArray(): array
     /**
      * @inheritDoc
      *
-     * @param   int     $options
+     * @param  int  $options
      * @return  string
      */
     public function toJson($options = 0): string
diff --git a/src/Support/ShippingAddress.php b/src/Support/ShippingAddress.php
index e8b38e6..04c79bf 100644
--- a/src/Support/ShippingAddress.php
+++ b/src/Support/ShippingAddress.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Support;
@@ -21,7 +22,7 @@ class ShippingAddress extends Address
     /**
      * @inheritDoc
      *
-     * @param \Corcel\Model $model
+     * @param  Model  $model
      */
     public function __construct(Model $model)
     {
diff --git a/src/Traits/AddressesTrait.php b/src/Traits/AddressesTrait.php
index 9087fce..00b0d29 100644
--- a/src/Traits/AddressesTrait.php
+++ b/src/Traits/AddressesTrait.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Traits;
diff --git a/src/Traits/HasRelationsThroughMeta.php b/src/Traits/HasRelationsThroughMeta.php
index b49be75..8f84761 100644
--- a/src/Traits/HasRelationsThroughMeta.php
+++ b/src/Traits/HasRelationsThroughMeta.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce\Traits;
@@ -12,26 +13,31 @@
 use InvalidArgumentException;
 use LogicException;
 
+/**
+ * @template TRelatedModel of Model
+ */
 trait HasRelationsThroughMeta
 {
     /**
      * Define a one-to-many relation through meta.
      *
-     * @param   string       $related
-     * @param   string       $metaKey
-     * @param   string|null  $foreignKey
-     * @param   string|null  $localKey
-     * @return  \Illuminate\Database\Eloquent\Relations\HasMany
+     * @param  string  $related
+     * @param  string  $metaKey
+     * @param  string|null  $foreignKey
+     * @param  string|null  $localKey
+     * @return  HasMany<TRelatedModel>
+     *
      * @throws  InvalidArgumentException
      * @throws  LogicException
      */
     public function hasManyThroughMeta(string $related, string $metaKey, string $foreignKey = null, string $localKey = null): HasMany
     {
+        /** @var Model */
         $model = $this->newRelatedInstance($related);
-        $meta  = $this->metaInstance($model);
+        $meta = $this->metaInstance($model);
 
         $foreignKey = $foreignKey ?: $this->getForeignKey();
-        $localKey   = $localKey ?: $this->getKeyName();
+        $localKey = $localKey ?: $this->getKeyName();
 
         return $this->hasMany($related, $meta->qualifyColumn('meta_value'))
             ->leftJoin($meta->getTable(), $this->joinClause(
@@ -45,14 +51,15 @@ public function hasManyThroughMeta(string $related, string $metaKey, string $for
     /**
      * Make meta model instance.
      *
-     * @param   \Illuminate\Database\Eloquent\Model  $model
+     * @param  \Illuminate\Database\Eloquent\Model  $model
      * @return  \Corcel\Model\Meta\Meta
+     *
      * @throws  InvalidArgumentException
      * @throws  LogicException
      */
     private function metaInstance(Model $model): Meta
     {
-        if (!method_exists($model, 'meta')) {
+        if (! method_exists($model, 'meta')) {
             throw new LogicException(sprintf(
                 'The model "%s" must have defined "meta" method. Adding "%s" trait will likely solve this problem.',
                 get_class($model),
@@ -62,7 +69,7 @@ private function metaInstance(Model $model): Meta
 
         $meta = $model->meta()->getRelated();
 
-        if (!$meta instanceof Meta) {
+        if (! $meta instanceof Meta) {
             throw new InvalidArgumentException(sprintf(
                 'The meta method of "%s" model must extends "%s" model.',
                 get_class($meta),
@@ -76,9 +83,9 @@ private function metaInstance(Model $model): Meta
     /**
      * Build join clause between model and meta tables.
      *
-     * @param   string  $localKey
-     * @param   string  $foreignKey
-     * @param   string  $metaKey
+     * @param  string  $localKey
+     * @param  string  $foreignKey
+     * @param  string  $metaKey
      * @return  Closure
      */
     private function joinClause(string $localKey, string $foreignKey, string $metaKey): Closure
diff --git a/src/WooCommerce.php b/src/WooCommerce.php
index d0c7586..632a029 100644
--- a/src/WooCommerce.php
+++ b/src/WooCommerce.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Corcel\WooCommerce;
@@ -12,7 +13,7 @@ class WooCommerce
      *
      * @var  string|null
      */
-    private static $currency;
+    private static ?string $currency = null;
 
     /**
      * Get the shop currency.
@@ -22,7 +23,9 @@ class WooCommerce
     public static function currency(): ?string
     {
         if (self::$currency === null) {
-            self::$currency = Option::get('woocommerce_currency');
+            $currency = Option::get('woocommerce_currency');
+
+            self::$currency = is_scalar($currency) ? (string) $currency : '';
         }
 
         return self::$currency;
diff --git a/stubs/Corcel.stub b/stubs/Corcel.stub
new file mode 100644
index 0000000..5a8d031
--- /dev/null
+++ b/stubs/Corcel.stub
@@ -0,0 +1,24 @@
+<?php
+
+namespace Corcel\Model {
+    /**
+     * @property string $ID
+     */
+    class Post {
+        //
+    }
+
+    /**
+     * @property string|null $taxonomy
+     */
+    class Taxonomy {
+        //
+    }
+
+    /**
+     * @property string $ID
+     */
+    class User {
+        //
+    }
+}
\ No newline at end of file
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 54890ab..a5aec0a 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Tests;
@@ -19,16 +20,14 @@ public function setUp(): void
         $this->loadMigrationsFrom([
             '--database' => 'wp',
             '--realpath' => true,
-            '--path'     => __DIR__ . '/database/migrations',
+            '--path'     => __DIR__.'/database/migrations',
         ]);
-
-        $this->withFactories(__DIR__ . '/database/factories');
     }
 
     /**
      * @inheritDoc
      *
-     * @param   \Illuminate\Foundation\Application  $app
+     * @param  \Illuminate\Foundation\Application  $app
      * @return  void
      */
     protected function getEnvironmentSetUp($app): void
@@ -39,7 +38,7 @@ protected function getEnvironmentSetUp($app): void
     /**
      * Configure database.
      *
-     * @param   \Illuminate\Foundation\Application  $app
+     * @param  \Illuminate\Foundation\Application  $app
      * @return  void
      */
     private function configureDatabaseConfig($app): void
diff --git a/tests/Unit/Model/CustomerTest.php b/tests/Unit/Model/CustomerTest.php
index 18ada3d..c9fee08 100644
--- a/tests/Unit/Model/CustomerTest.php
+++ b/tests/Unit/Model/CustomerTest.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Tests\Unit\Model;
@@ -30,21 +31,22 @@ public function testRelatedOrders(): void
     {
         $customer = $this->createCustomer();
 
-        /** @var \Corcel\WooCommerce\Model\Order */
-        $order = factory(Order::class)->create();
-        $order->createMeta('_customer_user', $customer->ID); // @phpstan-ignore-line
+        /** @var Order */
+        $order = Order::factory()->create();
+        $order->createMeta('_customer_user', $customer->ID);
 
         $this->assertTrue($customer->orders()->get()->first()->is($order)); // @phpstan-ignore-line
 
-        /** @var \Corcel\WooCommerce\Model\Order */
-        $order = factory(Order::class)->create();
-        $order->createMeta('_customer_user', $customer->ID); // @phpstan-ignore-line
+        /** @var Order */
+        $order = Order::factory()->create();
+        $order->createMeta('_customer_user', $customer->ID);
 
         $this->assertSame(2, $customer->orders()->count()); // @phpstan-ignore-line
     }
 
     private function createCustomer(): Customer
     {
-        return factory(Customer::class)->create();
+        /** @var Customer */
+        return Customer::factory()->create();
     }
 }
diff --git a/tests/Unit/Model/ItemTest.php b/tests/Unit/Model/ItemTest.php
index 88e6b16..dce7d77 100644
--- a/tests/Unit/Model/ItemTest.php
+++ b/tests/Unit/Model/ItemTest.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Tests\Unit\Model;
@@ -60,8 +61,9 @@ public function testTaxClassProperty(): void
 
     public function testRelatedOrder(): void
     {
-        $order = factory(Order::class)->create();
-        $item  = $this->createItem(['order_id' => $order->ID]);
+        /** @var Order */
+        $order = Order::factory()->create();
+        $item = $this->createItem(['order_id' => $order->ID]);
 
         $this->assertTrue($item->order->is($order));
     }
@@ -69,19 +71,22 @@ public function testRelatedOrder(): void
     public function testRelatedProduct(): void
     {
         /** @var \Corcel\WooCommerce\Model\Product */
-        $product = factory(Product::class)->create();
+        $product = Product::factory()->create();
 
         $item = $this->createItem();
-        $item->createMeta('_product_id', $product->ID); // @phpstan-ignore-line
+        $item->createMeta('_product_id', $product->ID);
 
         $this->assertTrue($item->product->is($product));
     }
 
     /**
-     * @param mixed[]  $attributes
+     * @param  mixed[]  $attributes
      */
     private function createItem(array $attributes = []): Item
     {
-        return factory(Item::class)->create($attributes);
+        /** @var Item */
+        $item = Item::factory()->create($attributes);
+
+        return $item;
     }
 }
diff --git a/tests/Unit/Model/OrderTest.php b/tests/Unit/Model/OrderTest.php
index 5769e43..1b5cb39 100644
--- a/tests/Unit/Model/OrderTest.php
+++ b/tests/Unit/Model/OrderTest.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Tests\Unit\Model;
@@ -117,7 +118,8 @@ public function testShippingAddressProperty(): void
 
     public function testArrayHasAppendedValues(): void
     {
-        $order = factory(Order::class)->create();
+        /** @var Order */
+        $order = Order::factory()->create();
         $array = $order->toArray();
 
         $this->assertArrayHasKey('currency', $array);
@@ -135,13 +137,13 @@ public function testArrayHasAppendedValues(): void
 
     public function testRelatedCustomer(): void
     {
-        /** @var \Corcel\WooCommerce\Model\Customer */
-        $customer = factory(Customer::class)->create();
+        /** @var Customer */
+        $customer = Customer::factory()->create();
 
         $order = $this->createOrder();
-        $order->createMeta('_customer_user', $customer->ID); // @phpstan-ignore-line
+        $order->createMeta('_customer_user', $customer->ID);
 
-        /** @var \Corcel\WooCommerce\Model\Customer */
+        /** @var Customer */
         $orderCustomer = $order->customer;
 
         $this->assertTrue($orderCustomer->is($customer));
@@ -158,16 +160,19 @@ public function testRelatedItems(): void
     {
         $order = $this->createOrder();
 
-        $item = factory(Item::class, 3)->create(['order_id' => $order->ID]); // @phpstan-ignore-line
+        $item = Item::factory()->count(3)->create(['order_id' => $order->ID]);
 
         $this->assertSame(3, $order->items->count());
     }
 
     /**
-     * @param mixed[]  $attributes
+     * @param  mixed[]  $attributes
      */
     private function createOrder(array $attributes = []): Order
     {
-        return factory(Order::class)->create($attributes);
+        /** @var Order */
+        $order = Order::factory()->create($attributes);
+
+        return $order;
     }
 }
diff --git a/tests/Unit/Model/ProductAttributeTest.php b/tests/Unit/Model/ProductAttributeTest.php
index bef0ae3..59c7848 100644
--- a/tests/Unit/Model/ProductAttributeTest.php
+++ b/tests/Unit/Model/ProductAttributeTest.php
@@ -1,10 +1,11 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Tests\Unit\Model;
 
 use Corcel\WooCommerce\Model\ProductAttribute;
-use Illuminate\Database\Eloquent\Collection;
+use Illuminate\Support\Collection;
 use Tests\TestCase;
 
 class ProductAttributeTest extends TestCase
diff --git a/tests/Unit/Model/ProductTest.php b/tests/Unit/Model/ProductTest.php
index 2dec95e..b37ff04 100644
--- a/tests/Unit/Model/ProductTest.php
+++ b/tests/Unit/Model/ProductTest.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Tests\Unit\Model;
@@ -157,12 +158,14 @@ public function testInStockProperty(): void
 
     public function testCrosssellsProperty(): void
     {
-        $crosssellProducts = factory(Product::class, 2)->create();
+        /** @var \Illuminate\Database\Eloquent\Collection<int, Product> */
+        $crosssellProducts = Product::factory()->count(2)->create();
 
         $product = $this->createProduct();
         $product->createMeta('_crosssell_ids', serialize($crosssellProducts->pluck('ID')->toArray()));
 
         $this->assertSame(2, $product->crosssells->count());
+        // @phpstan-ignore-next-line
         $this->assertTrue($product->crosssells->first()->is($crosssellProducts->first()));
     }
 
@@ -176,12 +179,14 @@ public function testEmptyCrosssells(): void
 
     public function testUpsellsProperty(): void
     {
-        $upsellProducts = factory(Product::class, 3)->create();
+        /** @var \Illuminate\Database\Eloquent\Collection<int, Product> */
+        $upsellProducts = Product::factory()->count(3)->create();
 
         $product = $this->createProduct();
         $product->createMeta('_upsell_ids', serialize($upsellProducts->pluck('ID')->toArray()));
 
         $this->assertSame(3, $product->upsells->count());
+        // @phpstan-ignore-next-line
         $this->assertTrue($product->upsells->first()->is($upsellProducts->first()));
     }
 
@@ -197,18 +202,24 @@ public function testRelatedItems(): void
     {
         $product = $this->createProduct();
 
-        $firstItem = factory(Item::class)->create();
-        $firstItem->createMeta('_product_id', $product->ID); // @phpstan-ignore-line
+        /** @var Item */
+        $firstItem = Item::factory()->create();
+        $firstItem->createMeta('_product_id', $product->ID);
 
-        $secondItem = factory(Item::class)->create();
-        $secondItem->createMeta('_product_id', $product->ID); // @phpstan-ignore-line
+        /** @var Item */
+        $secondItem = Item::factory()->create();
+        $secondItem->createMeta('_product_id', $product->ID);
 
         $this->assertSame(2, $product->items->count());
+        // @phpstan-ignore-next-line
         $this->assertTrue($product->items->first()->is($firstItem));
     }
 
     private function createProduct(): Product
     {
-        return factory(Product::class)->create();
+        /** @var Product */
+        $product = Product::factory()->create();
+
+        return $product;
     }
 }
diff --git a/tests/Unit/Support/AddressTest.php b/tests/Unit/Support/AddressTest.php
index 449abb2..f593179 100644
--- a/tests/Unit/Support/AddressTest.php
+++ b/tests/Unit/Support/AddressTest.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Tests\Unit\Support;
@@ -15,7 +16,8 @@ public function testInvalidModel(): void
     {
         $this->expectException(InvalidArgumentException::class);
 
-        $model = factory(Item::class)->create();
+        /** @var Item */
+        $model = Item::factory()->create();
 
         new Address($model, 'billing');
     }
@@ -24,12 +26,14 @@ public function testInvalidJson(): void
     {
         $this->expectException(InvalidArgumentException::class);
 
-        $order   = factory(Order::class)->create();
-        $address = new class($order, 'billing') extends Address {
+        /** @var Order */
+        $order = Order::factory()->create();
+        $address = new class($order, 'billing') extends Address
+        {
             public function toArray(): array
             {
                 return [
-                    fopen('php://input', 'r'),
+                    'invalid' => fopen('php://input', 'r'),
                 ];
             }
         };
diff --git a/tests/Unit/Support/BillingAddressTest.php b/tests/Unit/Support/BillingAddressTest.php
index 6cb93a2..b8ecd6c 100644
--- a/tests/Unit/Support/BillingAddressTest.php
+++ b/tests/Unit/Support/BillingAddressTest.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Tests\Unit\Support;
@@ -113,7 +114,8 @@ public function testInvalidProperty(): void
 
     private function createOrderBillingAddress(): BillingAddress
     {
-        $order = factory(Order::class)->create();
+        /** @var Order */
+        $order = Order::factory()->create();
         $order->createMeta(self::ORDER_META_FIELDS);
 
         return new BillingAddress($order);
@@ -121,7 +123,8 @@ private function createOrderBillingAddress(): BillingAddress
 
     private function createCustomerBillingAddress(): BillingAddress
     {
-        $customer = factory(Customer::class)->create();
+        /** @var Customer */
+        $customer = Customer::factory()->create();
         $customer->createMeta(self::CUSTOMER_META_FIELDS);
 
         return new BillingAddress($customer);
diff --git a/tests/Unit/Support/PaymentTest.php b/tests/Unit/Support/PaymentTest.php
index aac62cf..6d3abf1 100644
--- a/tests/Unit/Support/PaymentTest.php
+++ b/tests/Unit/Support/PaymentTest.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Tests\Unit\Support;
@@ -22,7 +23,7 @@ public function testProperties(): void
     public function testToArrayMethod(): void
     {
         $payment = $this->createPayment();
-        $array   = [
+        $array = [
             'method'         => 'test',
             'method_title'   => 'Test',
             'transaction_id' => 'tid-000',
@@ -34,7 +35,7 @@ public function testToArrayMethod(): void
     public function testToJsonMethod(): void
     {
         $payment = $this->createPayment();
-        $json    = '{"method":"test","method_title":"Test","transaction_id":"tid-000"}';
+        $json = '{"method":"test","method_title":"Test","transaction_id":"tid-000"}';
 
         $this->assertSame($json, $payment->toJson());
     }
@@ -43,12 +44,14 @@ public function testInvalidJson(): void
     {
         $this->expectException(InvalidArgumentException::class);
 
-        $order   = factory(Order::class)->create();
-        $payment = new class($order) extends Payment {
+        /** @var Order */
+        $order = Order::factory()->create();
+        $payment = new class($order) extends Payment
+        {
             public function toArray(): array
             {
                 return [
-                    fopen('php://input', 'r'),
+                    'invalid' => fopen('php://input', 'r'),
                 ];
             }
         };
@@ -58,7 +61,8 @@ public function toArray(): array
 
     private function createPayment(): Payment
     {
-        $order = factory(Order::class)->create();
+        /** @var Order */
+        $order = Order::factory()->create();
         $order->createMeta([
             '_payment_method'       => 'test',
             '_payment_method_title' => 'Test',
diff --git a/tests/Unit/Support/ShippingAddressTest.php b/tests/Unit/Support/ShippingAddressTest.php
index fefe8fc..be0e71c 100644
--- a/tests/Unit/Support/ShippingAddressTest.php
+++ b/tests/Unit/Support/ShippingAddressTest.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Tests\Unit\Support;
@@ -103,7 +104,8 @@ public function testInvalidProperty(): void
 
     private function createOrderShippingAddress(): ShippingAddress
     {
-        $order = factory(Order::class)->create();
+        /** @var Order */
+        $order = Order::factory()->create();
         $order->createMeta(self::ORDER_META_FIELDS);
 
         return new ShippingAddress($order);
@@ -111,7 +113,8 @@ private function createOrderShippingAddress(): ShippingAddress
 
     private function createCustomerShippingAddress(): ShippingAddress
     {
-        $customer = factory(Customer::class)->create();
+        /** @var Customer */
+        $customer = Customer::factory()->create();
         $customer->createMeta(self::CUSTOMER_META_FIELDS);
 
         return new ShippingAddress($customer);
diff --git a/tests/Unit/Traits/HasRelationsThroughMetaTest.php b/tests/Unit/Traits/HasRelationsThroughMetaTest.php
index b2eb997..b294a0e 100644
--- a/tests/Unit/Traits/HasRelationsThroughMetaTest.php
+++ b/tests/Unit/Traits/HasRelationsThroughMetaTest.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Tests\Unit\Traits;
@@ -16,9 +17,16 @@ public function testInvalidModel(): void
     {
         $this->expectException(LogicException::class);
 
-        $model = new class() extends Model {
+        $model = new class() extends Model
+        {
+            /**
+             * @use HasRelationsThroughMeta<\Illuminate\Database\Eloquent\Model>
+             */
             use HasRelationsThroughMeta;
 
+            /**
+             * @return HasMany<\Illuminate\Database\Eloquent\Model>
+             */
             public function relatedObjects(): HasMany
             {
                 return $this->hasManyThroughMeta(Model::class, '_meta_key', 'foreign_key', 'local_key');
@@ -32,7 +40,11 @@ public function testInvalidMeta(): void
     {
         $this->expectException(InvalidArgumentException::class);
 
-        $model = new class() extends Model {
+        $model = new class() extends Model
+        {
+            /**
+             * @use HasRelationsThroughMeta<\Illuminate\Database\Eloquent\Model>
+             */
             use HasRelationsThroughMeta;
 
             /** @var \Corcel\Model */
@@ -43,13 +55,20 @@ public function setRelatedModel(Model $relatedModel): void
                 $this->relatedModel = $relatedModel;
             }
 
+            /**
+             * @return HasMany<\Illuminate\Database\Eloquent\Model>
+             */
             public function relatedObjects(): HasMany
             {
                 return $this->hasManyThroughMeta(get_class($this->relatedModel), '_meta_key', 'foreign_key', 'local_key');
             }
         };
 
-        $model->setRelatedModel(new class() extends Model {
+        $model->setRelatedModel(new class() extends Model
+        {
+            /**
+             * @return HasMany<\Corcel\Model>
+             */
             public function meta(): HasMany
             {
                 return $this->hasMany(Model::class);
diff --git a/tests/Unit/WooCommerceTest.php b/tests/Unit/WooCommerceTest.php
index 389182f..a0544f1 100644
--- a/tests/Unit/WooCommerceTest.php
+++ b/tests/Unit/WooCommerceTest.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 namespace Tests\Unit;
diff --git a/tests/database/factories/CustomerFactory.php b/tests/database/factories/CustomerFactory.php
index 5c13844..dde1331 100644
--- a/tests/database/factories/CustomerFactory.php
+++ b/tests/database/factories/CustomerFactory.php
@@ -1,24 +1,39 @@
 <?php
+
 declare(strict_types=1);
 
-/** @var \Illuminate\Database\Eloquent\Factory $factory */
+namespace Database\Factories;
 
 use Corcel\WooCommerce\Model\Customer;
-use Faker\Generator as Faker;
+use Illuminate\Database\Eloquent\Factories\Factory;
 use Illuminate\Support\Str;
 
-$factory->define(Customer::class, function (Faker $faker) {
-    $name = $faker->firstName;
+/**
+ * @extends Factory<Customer>
+ */
+class CustomerFactory extends Factory
+{
+    protected $model = Customer::class;
+
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition()
+    {
+        $name = $this->faker->firstName;
 
-    return [
-        'user_login'          => Str::lower(Str::ascii($name)),
-        'user_pass'           => bcrypt('secret'),
-        'user_nicename'       => $name,
-        'user_email'          => $faker->email,
-        'user_url'            => $faker->url,
-        'user_registered'     => $faker->dateTime,
-        'user_activation_key' => Str::random(10),
-        'user_status'         => 0,
-        'display_name'        => $name,
-    ];
-});
+        return [
+            'user_login'          => Str::lower(Str::ascii($name)),
+            'user_pass'           => bcrypt('secret'),
+            'user_nicename'       => $name,
+            'user_email'          => $this->faker->email,
+            'user_url'            => $this->faker->url,
+            'user_registered'     => $this->faker->dateTime,
+            'user_activation_key' => Str::random(10),
+            'user_status'         => 0,
+            'display_name'        => $name,
+        ];
+    }
+}
diff --git a/tests/database/factories/ItemFactory.php b/tests/database/factories/ItemFactory.php
index 5841b7d..aa3d446 100644
--- a/tests/database/factories/ItemFactory.php
+++ b/tests/database/factories/ItemFactory.php
@@ -1,15 +1,30 @@
 <?php
+
 declare(strict_types=1);
 
-/** @var \Illuminate\Database\Eloquent\Factory $factory */
+namespace Database\Factories;
 
 use Corcel\WooCommerce\Model\Item;
-use Faker\Generator as Faker;
-
-$factory->define(Item::class, function (Faker $faker) {
-    return [
-        'order_item_name' => $faker->words(mt_rand(2, 4), true),
-        'order_item_type' => $faker->randomElement(['line_item', 'tax', 'coupon']),
-        'order_id'        => $faker->numberBetween(1, 10000),
-    ];
-});
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends Factory<Item>
+ */
+class ItemFactory extends Factory
+{
+    protected $model = Item::class;
+
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition()
+    {
+        return [
+            'order_item_name' => $this->faker->words(mt_rand(2, 4), true),
+            'order_item_type' => $this->faker->randomElement(['line_item', 'tax', 'coupon']),
+            'order_id'        => $this->faker->numberBetween(1, 10000),
+        ];
+    }
+}
diff --git a/tests/database/factories/OrderFactory.php b/tests/database/factories/OrderFactory.php
index 42fe82f..552ce43 100644
--- a/tests/database/factories/OrderFactory.php
+++ b/tests/database/factories/OrderFactory.php
@@ -1,100 +1,155 @@
 <?php
+
 declare(strict_types=1);
 
-/** @var \Illuminate\Database\Eloquent\Factory $factory */
+namespace Database\Factories;
 
 use Corcel\WooCommerce\Model\Order;
-use Faker\Generator as Faker;
+use DateTimeImmutable;
+use DateTimeZone;
+use Illuminate\Database\Eloquent\Factories\Factory;
 
-$factory->define(Order::class, function (Faker $faker) {
-    $createdAt = DateTimeImmutable::createFromMutable($faker->dateTime('now', 'Europe/Warsaw'));
-    $createdAtGMT = $createdAt->setTimezone(new DateTimeZone('UTC'));
+/**
+ * @extends Factory<Order>
+ */
+class OrderFactory extends Factory
+{
+    protected $model = Order::class;
 
-    return [
-        'post_author'           => $faker->numberBetween(1, 100),
-        'post_date'             => $createdAt->format('Y-m-d H:i:s'),
-        'post_date_gmt'         => $createdAtGMT->format('Y-m-d H:i:s'),
-        'post_content'          => '',
-        'post_title'            => sprintf('Order &ndash; %s', $createdAt->format('F j, Y @ h:i A')),
-        'post_excerpt'          => '',
-        'post_status'           => 'wc-completed',
-        'comment_status'        => 'closed',
-        'ping_status'           => 'closed',
-        'post_password'         => '',
-        'post_name'             => '',
-        'to_ping'               => '',
-        'pinged'                => '',
-        'post_modified'         => $createdAt->format('Y-m-d H:i:s'),
-        'post_modified_gmt'     => $createdAtGMT->format('Y-m-d H:i:s'),
-        'post_content_filtered' => '',
-        'post_parent'           => 0,
-        'guid'                  => 'http://woocommerce.example/?post_type=shop_order&p=1',
-        'menu_order'            => 0,
-        'post_type'             => 'shop_order',
-        'post_mime_type'        => '',
-        'comment_count'         => 0,
-    ];
-});
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition()
+    {
+        $createdAt = DateTimeImmutable::createFromMutable($this->faker->dateTime('now', 'Europe/Warsaw'));
+        $createdAtGMT = $createdAt->setTimezone(new DateTimeZone('UTC'));
 
-$factory->state(Order::class, 'pending', [
-    'post_status' => 'wc-pending',
-]);
+        return [
+            'post_author'           => $this->faker->numberBetween(1, 100),
+            'post_date'             => $createdAt->format('Y-m-d H:i:s'),
+            'post_date_gmt'         => $createdAtGMT->format('Y-m-d H:i:s'),
+            'post_content'          => '',
+            'post_title'            => sprintf('Order &ndash; %s', $createdAt->format('F j, Y @ h:i A')),
+            'post_excerpt'          => '',
+            'post_status'           => 'wc-completed',
+            'comment_status'        => 'closed',
+            'ping_status'           => 'closed',
+            'post_password'         => '',
+            'post_name'             => '',
+            'to_ping'               => '',
+            'pinged'                => '',
+            'post_modified'         => $createdAt->format('Y-m-d H:i:s'),
+            'post_modified_gmt'     => $createdAtGMT->format('Y-m-d H:i:s'),
+            'post_content_filtered' => '',
+            'post_parent'           => 0,
+            'guid'                  => 'http://woocommerce.example/?post_type=shop_order&p=1',
+            'menu_order'            => 0,
+            'post_type'             => 'shop_order',
+            'post_mime_type'        => '',
+            'comment_count'         => 0,
+        ];
+    }
 
-$factory->state(Order::class, 'cancelled', [
-    'post_status' => 'wc-cancelled',
-]);
+    /**
+     * Applies pending state to model.
+     *
+     * @return  Factory<Order>
+     */
+    public function pending(): Factory
+    {
+        return $this->state(fn () => ['post_status' => 'wc-pending']);
+    }
 
-$factory->state(Order::class, 'refunded', [
-    'post_status' => 'wc-refunded',
-]);
+    /**
+     * Applies cancelling state to model.
+     *
+     * @return  Factory<Order>
+     */
+    public function cancelled(): Factory
+    {
+        return $this->state(fn () => ['post_status' => 'wc-cancelled']);
+    }
 
-$factory->state(Order::class, 'withMeta', []);
-$factory->state(Order::class, 'withShipping', []);
-$factory->state(Order::class, 'paid', []);
+    /**
+     * Applies refunded state to model.
+     *
+     * @return  Factory<Order>
+     */
+    public function refunded(): Factory
+    {
+        return $this->state(fn () => ['post_status' => 'wc-refunded']);
+    }
 
-$factory->afterCreatingState(Order::class, 'withMeta', function (Order $order, Faker $faker) {
-    $order->createMeta([
-        '_order_currency'     => $faker->currencyCode,
-        '_order_total'        => $faker->randomFloat(2, 0, 200),
-        '_order_tax'          => $faker->randomFloat(2, 0, 200),
-        '_date_completed'     => $faker->dateTime->format('Y-m-d H:i:s'),
-        '_billing_first_name' => $faker->firstName,
-        '_billing_last_name'  => $faker->lastName,
-        '_billing_company'    => $faker->optional()->company,
-        '_billing_address_1'  => $faker->streetAddress,
-        '_billing_address_2'  => $faker->optional()->secondaryAddress,
-        '_billing_city'       => $faker->city,
-        '_billing_state'      => $faker->state,
-        '_billing_postcode'   => $faker->postcode,
-        '_billing_country'    => $faker->country,
-        '_billing_email'      => $faker->email,
-        '_billing_phone'      => $faker->phoneNumber,
-    ]);
-});
+    /**
+     * Applies withMeta state to model.
+     *
+     * @return  Factory<Order>
+     */
+    public function withMeta(): Factory
+    {
+        return $this->afterCreating(function (Order $order) {
+            $order->createMeta([
+                '_order_currency'     => $this->faker->currencyCode,
+                '_order_total'        => $this->faker->randomFloat(2, 0, 200),
+                '_order_tax'          => $this->faker->randomFloat(2, 0, 200),
+                '_date_completed'     => $this->faker->dateTime->format('Y-m-d H:i:s'),
+                '_billing_first_name' => $this->faker->firstName,
+                '_billing_last_name'  => $this->faker->lastName,
+                '_billing_company'    => $this->faker->optional()->company,
+                '_billing_address_1'  => $this->faker->streetAddress,
+                '_billing_address_2'  => $this->faker->optional()->secondaryAddress,
+                '_billing_city'       => $this->faker->city,
+                '_billing_state'      => $this->faker->state,
+                '_billing_postcode'   => $this->faker->postcode,
+                '_billing_country'    => $this->faker->country,
+                '_billing_email'      => $this->faker->email,
+                '_billing_phone'      => $this->faker->phoneNumber,
+            ]);
+        });
+    }
 
-$factory->afterCreatingState(Order::class, 'withShipping', function (Order $order, Faker $faker) {
-    $order->createMeta([
-        '_order_shipping'      => $faker->randomFloat(2, 0, 200),
-        '_order_shipping_tax'  => $faker->randomFloat(2, 0, 200),
-        '_shipping_first_name' => $faker->firstName,
-        '_shipping_last_name'  => $faker->lastName,
-        '_shipping_company'    => $faker->optional()->company,
-        '_shipping_address_1'  => $faker->streetAddress,
-        '_shipping_address_2'  => $faker->optional()->secondaryAddress,
-        '_shipping_city'       => $faker->city,
-        '_shipping_state'      => $faker->state,
-        '_shipping_postcode'   => $faker->postcode,
-        '_shipping_country'    => $faker->country,
-    ]);
-});
+    /**
+     * Applies withShipping state to model.
+     *
+     * @return  Factory<Order>
+     */
+    public function withShipping(): Factory
+    {
+        return $this->afterCreating(function (Order $order) {
+            $order->createMeta([
+                '_order_shipping'      => $this->faker->randomFloat(2, 0, 200),
+                '_order_shipping_tax'  => $this->faker->randomFloat(2, 0, 200),
+                '_shipping_first_name' => $this->faker->firstName,
+                '_shipping_last_name'  => $this->faker->lastName,
+                '_shipping_company'    => $this->faker->optional()->company,
+                '_shipping_address_1'  => $this->faker->streetAddress,
+                '_shipping_address_2'  => $this->faker->optional()->secondaryAddress,
+                '_shipping_city'       => $this->faker->city,
+                '_shipping_state'      => $this->faker->state,
+                '_shipping_postcode'   => $this->faker->postcode,
+                '_shipping_country'    => $this->faker->country,
+            ]);
+        });
+    }
 
-$factory->afterCreatingState(Order::class, 'paid', function (Order $order, Faker $faker) {
-    $paymentMethod = $faker->word;
+    /**
+     * Applies paid state to model.
+     *
+     * @return  Factory<Order>
+     */
+    public function paid(): Factory
+    {
+        return $this->afterCreating(function (Order $order) {
+            $paymentMethod = $this->faker->word;
 
-    $order->createMeta([
-        '_date_paid'            => $faker->dateTime->format('Y-m-d H:i:s'),
-        '_payment_method'       => $paymentMethod,
-        '_payment_method_title' => ucfirst($paymentMethod),
-        '_transaction_id'       => $faker->asciify('*******'),
-    ]);
-});
+            $order->createMeta([
+                '_date_paid'            => $this->faker->dateTime->format('Y-m-d H:i:s'),
+                '_payment_method'       => $paymentMethod,
+                '_payment_method_title' => ucfirst($paymentMethod),
+                '_transaction_id'       => $this->faker->asciify('*******'),
+            ]);
+        });
+    }
+}
diff --git a/tests/database/factories/ProductFactory.php b/tests/database/factories/ProductFactory.php
index 7906a54..8178360 100644
--- a/tests/database/factories/ProductFactory.php
+++ b/tests/database/factories/ProductFactory.php
@@ -1,39 +1,56 @@
 <?php
+
 declare(strict_types=1);
 
-/** @var \Illuminate\Database\Eloquent\Factory $factory */
+namespace Database\Factories;
 
 use Corcel\WooCommerce\Model\Product;
-use Faker\Generator as Faker;
+use DateTimeImmutable;
+use DateTimeZone;
+use Illuminate\Database\Eloquent\Factories\Factory;
 use Illuminate\Support\Str;
 
-$factory->define(Product::class, function (Faker $faker) {
-    $createdAt = DateTimeImmutable::createFromMutable($faker->dateTime('now', 'Europe/Warsaw'));
-    $createdAtGMT = $createdAt->setTimezone(new DateTimeZone('UTC'));
-    $name = $faker->sentence;
+/**
+ * @extends Factory<Product>
+ */
+class ProductFactory extends Factory
+{
+    protected $model = Product::class;
+
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition()
+    {
+        $createdAt = DateTimeImmutable::createFromMutable($this->faker->dateTime('now', 'Europe/Warsaw'));
+        $createdAtGMT = $createdAt->setTimezone(new DateTimeZone('UTC'));
+        $name = $this->faker->sentence;
 
-    return [
-        'post_author'           => $faker->numberBetween(1, 100),
-        'post_date'             => $createdAt->format('Y-m-d H:i:s'),
-        'post_date_gmt'         => $createdAtGMT->format('Y-m-d H:i:s'),
-        'post_content'          => $faker->paragraphs(mt_rand(1, 5), true),
-        'post_title'            => $name,
-        'post_excerpt'          => $faker->paragraph,
-        'post_status'           => 'publish',
-        'comment_status'        => 'open',
-        'ping_status'           => 'closed',
-        'post_password'         => '',
-        'post_name'             => Str::title($name),
-        'to_ping'               => '',
-        'pinged'                => '',
-        'post_modified'         => $createdAt->format('Y-m-d H:i:s'),
-        'post_modified_gmt'     => $createdAtGMT->format('Y-m-d H:i:s'),
-        'post_content_filtered' => '',
-        'post_parent'           => 0,
-        'guid'                  => 'http://woocommerce.example/?post_type=product&p=1',
-        'menu_order'            => 0,
-        'post_type'             => 'product',
-        'post_mime_type'        => '',
-        'comment_count'         => 0,
-    ];
-});
+        return [
+            'post_author'           => $this->faker->numberBetween(1, 100),
+            'post_date'             => $createdAt->format('Y-m-d H:i:s'),
+            'post_date_gmt'         => $createdAtGMT->format('Y-m-d H:i:s'),
+            'post_content'          => $this->faker->paragraphs(mt_rand(1, 5), true),
+            'post_title'            => $name,
+            'post_excerpt'          => $this->faker->paragraph,
+            'post_status'           => 'publish',
+            'comment_status'        => 'open',
+            'ping_status'           => 'closed',
+            'post_password'         => '',
+            'post_name'             => Str::title($name),
+            'to_ping'               => '',
+            'pinged'                => '',
+            'post_modified'         => $createdAt->format('Y-m-d H:i:s'),
+            'post_modified_gmt'     => $createdAtGMT->format('Y-m-d H:i:s'),
+            'post_content_filtered' => '',
+            'post_parent'           => 0,
+            'guid'                  => 'http://woocommerce.example/?post_type=product&p=1',
+            'menu_order'            => 0,
+            'post_type'             => 'product',
+            'post_mime_type'        => '',
+            'comment_count'         => 0,
+        ];
+    }
+}
diff --git a/tests/database/migrations/2020_01_01_000000_create_options_table.php b/tests/database/migrations/2020_01_01_000000_create_options_table.php
index cc44b17..184dd0b 100644
--- a/tests/database/migrations/2020_01_01_000000_create_options_table.php
+++ b/tests/database/migrations/2020_01_01_000000_create_options_table.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 use Illuminate\Database\Migrations\Migration;
diff --git a/tests/database/migrations/2020_01_01_000000_create_postmeta_table.php b/tests/database/migrations/2020_01_01_000000_create_postmeta_table.php
index d7bf2a5..77810ec 100644
--- a/tests/database/migrations/2020_01_01_000000_create_postmeta_table.php
+++ b/tests/database/migrations/2020_01_01_000000_create_postmeta_table.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 use Illuminate\Database\Migrations\Migration;
diff --git a/tests/database/migrations/2020_01_01_000000_create_posts_table.php b/tests/database/migrations/2020_01_01_000000_create_posts_table.php
index 3598d6b..50c2eca 100644
--- a/tests/database/migrations/2020_01_01_000000_create_posts_table.php
+++ b/tests/database/migrations/2020_01_01_000000_create_posts_table.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 use Illuminate\Database\Migrations\Migration;
diff --git a/tests/database/migrations/2020_01_01_000000_create_term_relationships_table.php b/tests/database/migrations/2020_01_01_000000_create_term_relationships_table.php
index 2fd8ef5..7249ab6 100644
--- a/tests/database/migrations/2020_01_01_000000_create_term_relationships_table.php
+++ b/tests/database/migrations/2020_01_01_000000_create_term_relationships_table.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 use Illuminate\Database\Migrations\Migration;
diff --git a/tests/database/migrations/2020_01_01_000000_create_term_taxonomy_table.php b/tests/database/migrations/2020_01_01_000000_create_term_taxonomy_table.php
index 437645f..39c98e8 100644
--- a/tests/database/migrations/2020_01_01_000000_create_term_taxonomy_table.php
+++ b/tests/database/migrations/2020_01_01_000000_create_term_taxonomy_table.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 use Illuminate\Database\Migrations\Migration;
diff --git a/tests/database/migrations/2020_01_01_000000_create_terms_table.php b/tests/database/migrations/2020_01_01_000000_create_terms_table.php
index 385eab0..2a514e8 100644
--- a/tests/database/migrations/2020_01_01_000000_create_terms_table.php
+++ b/tests/database/migrations/2020_01_01_000000_create_terms_table.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 use Illuminate\Database\Migrations\Migration;
diff --git a/tests/database/migrations/2020_01_01_000000_create_usermeta_table.php b/tests/database/migrations/2020_01_01_000000_create_usermeta_table.php
index c29c283..8984e8a 100644
--- a/tests/database/migrations/2020_01_01_000000_create_usermeta_table.php
+++ b/tests/database/migrations/2020_01_01_000000_create_usermeta_table.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 use Illuminate\Database\Migrations\Migration;
diff --git a/tests/database/migrations/2020_01_01_000000_create_users_table.php b/tests/database/migrations/2020_01_01_000000_create_users_table.php
index 0029604..2d12a1a 100644
--- a/tests/database/migrations/2020_01_01_000000_create_users_table.php
+++ b/tests/database/migrations/2020_01_01_000000_create_users_table.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 use Illuminate\Database\Migrations\Migration;
diff --git a/tests/database/migrations/2020_01_01_000000_create_woocommerce_attribute_taxonomies_table.php b/tests/database/migrations/2020_01_01_000000_create_woocommerce_attribute_taxonomies_table.php
index dd631fb..3f6bcb9 100644
--- a/tests/database/migrations/2020_01_01_000000_create_woocommerce_attribute_taxonomies_table.php
+++ b/tests/database/migrations/2020_01_01_000000_create_woocommerce_attribute_taxonomies_table.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 use Illuminate\Database\Migrations\Migration;
diff --git a/tests/database/migrations/2020_01_01_000000_create_woocommerce_order_itemmeta_table.php b/tests/database/migrations/2020_01_01_000000_create_woocommerce_order_itemmeta_table.php
index 12c7485..aa6d361 100644
--- a/tests/database/migrations/2020_01_01_000000_create_woocommerce_order_itemmeta_table.php
+++ b/tests/database/migrations/2020_01_01_000000_create_woocommerce_order_itemmeta_table.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 use Illuminate\Database\Migrations\Migration;
diff --git a/tests/database/migrations/2020_01_01_000000_create_woocommerce_order_items_table.php b/tests/database/migrations/2020_01_01_000000_create_woocommerce_order_items_table.php
index e77683c..57817d8 100644
--- a/tests/database/migrations/2020_01_01_000000_create_woocommerce_order_items_table.php
+++ b/tests/database/migrations/2020_01_01_000000_create_woocommerce_order_items_table.php
@@ -1,4 +1,5 @@
 <?php
+
 declare(strict_types=1);
 
 use Illuminate\Database\Migrations\Migration;
diff --git a/tests/stubs/Taxonomy.php.stub b/tests/stubs/Taxonomy.php.stub
deleted file mode 100644
index 32600a5..0000000
--- a/tests/stubs/Taxonomy.php.stub
+++ /dev/null
@@ -1,10 +0,0 @@
-<?php
-
-namespace Corcel\Model {
-    /**
-     * @property string|null $taxonomy
-     */
-    class Taxonomy {
-        //
-    }
-}
\ No newline at end of file